Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c63c9a1bdf0cd36c1b85139d16246381c3fe0fc4c122cc63c3897e7d1533ce' 
  AND token = 'AX/x0qNfXquCpKy0uxhf6lcYxS2NiE+Q4ReR/hhNvBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}